This Ergobaby Infant Insert is compatible with the Ergobaby Performance baby carrier and supports your baby from birth. Its ergonomic design keeps baby in a natural seated position, providing neck and head support to allow natural movement and growth. The Infant Insert grows with your baby, and can be used from birth. Please note: this Infant Insert is essential in order to use Ergobaby Performance baby carriers with babies from birth to 5 months or 5.4kg in weight.